Self-adjusting friction-band



c. c. FAY. SELF ADJUSTING FRICTION BAND APPLICATION FILED FEB- 2, 1920.

' 1,371,416, Patented Mar.15,1921.

INVIENTOR ATTORNEY PATENT OFFICE.

C LAREN'GE C. FAY, OF TdWER, MINNESOTA.

SELF-ADJUSTING FRICTION-BAND.

Application filed February 2, 1920.

T 0 aZZ whomz't may concern:

Be 1t known that I, CLARENCE C. FAY, a

vcitizen of the United States, residin at Tower, in the county of St. Louis and tate of Minnesota, have invented certain new'and useful Improvements in Self- Adjusting Friction-Bands, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to automatic adjusting devices for friction bands and has special reference to bands such as are used in transmission devices for automobiles. embodiment of the invention here shown and described is particularly'adapted for use in the'transmission of a Ford automobile.

The principal object of the invention is to produce a practical automatic take-up device for bands of this character.

Other objects and advantages will appear in the further description of the invention.

In the accompanying drawings forming I part of this application:

Figure 1 is an elevation of a fragmental portion of a friction band viewed axially thereof.

Fig.2 is an underside view of a fragmental portion of the normally stationary pilot lug, and v Fig. 3 is a similar view of a fragmental portion of the movable pilot lug and its pivotally connected dog.

The numeral 1 represents the band the normally operated end of which has rigidly fixed thereto the pilot lug 2, and to the opposite end of the band is slidably attached the normally stationary pilot lug 3. These two lugs, in general appearance, are similar to those ordinarily found upon the three brake bands in the transmission of a Ford car and are engaged and operate in all respects in the usual manner, by the pedal shaft 4, the lugs being normally separated shaft.

v The inwardly protruding hub 6 formed integral with the transmission housing forms an abutment for the pilot lug 3 and the reciprocal motion of thepedal shaft 4 is what operates the opposite end of the band together with the counteracting motion of the spring 5.

In my improved structure the band 1 is slidably attached to the lug 3, there being slotted holes -7 and 8 provided for the rivets 9 and 10 respectively,'which latter are rig- Specification of Letters Patent.

The

by the expansive spiral spring 5, upon said Patented Mar. 15, 1921.

' Serial no. 355,543.

idly carried by the band, and under the head of the rivet 10 is an expansive flat spring 12 the ends of which impinge against the back of the lug and normally hold the band in engagement with the inner face of the lug.

The inner face of the lug 3' has a cut-away portion 13 across its entire face and also has a central cut-out portion 14, which bifurcates the under face of the lug to a circumferential depth somewhat greater than the width of the upstanding bifurcated portion of the lug. On either side of the cut-away portion or slot 14 the lower terminations of the upstanding portions of the lug are serrated or provided with teeth as at 15 so that there are two series of teeth, one upon either side of the slot 14, and the cut-away portion 13 is simply to provide clearance for the transversely toothed section 16 of the end of the band,"and portions of which teeth normally register with the toothed sections 15 of the lug.

The toothed section 16 ofthe band is preferably made to extend past the inner face of the upstanding bifurcated portion of the lug 3, toward the lug 2, when the inner termination of the toothed section abuts the lower termination of the cut away. portion 13, such arrangement of parts providing ample room for ultimate adjustment of the band.

At the base of the bifurcated upstanding portion of the pilot lug 2 are formed two inwardly projecting lugs 17.the space intermediate of said lugs being cut away beneath mounted intermediate of the lug 17 as at 20, said pivotal end of the dog being provided with a slotted hole 21 surrounding the pivotpin. 20. The free end of the dog reaches across the gap intermediate of the two pilot lugs'of the band, and extends within the entrance tothe slot 14, it having provided upon the end thereof a series of preferably seven or eight teeth, which normally engage the exposed teeth on the end'of the band, within the. slot 14. To insure such engagement of the dog 19 a depressive flat leaf spring 22 of any desired form is attached in any convenient manner with n the slot 14, to maintain a downward pressure upon the head of" the dog.

. The device operates as follows: 7

The band having first been positioned about the drum to which it is engaged, the dog 19 when forced into the mouth of the slot 14; by the bringing together of the pilot .lugs 2 and 3, will immediately engage the becomes sufiiciently worn to allow the pin 20, during its reciprocal motion, to forcibly engage the farthesti termination of the slot 21 in the dog 19, upon its outward stroke. When the dogisqfihus engaged sufliciently it willreach forward, into theslot 14 of the opposite-pilot, and be advanced enough to engage one more notch in the band, then when the pilot lug 2 is released to its full return stroke the pin 20 will be found to engage theopposite or inner-end of the slot 21 andtend, by the action of the spring 5,, .to

draw the ilog' 19 back home to its original position. This action will, as is obvious,

the dog, to wit, one notch of the relation between the-end of the band and the toothedportions 15 of the pilot'block 3,th1 s short ening the band just'one notch where it" may continue in service until sufiiciently worn to make another similar contraction as above described. m

This advancement of the ban din relation to the pilot block 3 makes evident the necessity of the slottedholes 7 and 8 for the rivets 9 and 10 which will permitthem to creep up on the pilot block'as the band advances, furthermore the serrated end 16 of the band having to spring'away from the face ofthe block 3 slightly in its advancement, makes manifest the advantage of the spring 12 under the head of the'rivet 10 to permit of suchiresilient actionand still hold the scribed may be considerably departed from without affecting the scope of the appended claims-.'

WVhat I claim-is: 1. The combination with a brake band of the character described having-reciprocable means cooperatively. engaged therewith for applying and releasing the band, of interlocking cobperative means carried by the ends of the band, forthe purpose described.

2. The combination with a brake band of the character described having reciprocable means cooperatively-engaged therewith for applying and releasing the band, of reciprocal means carried upon one end ofthe band and fixed means upon the opposite end of the band cooperatively engageable' by said last mentioned reciprocal means sub- V w 'stantially as and for the purpose described. pull the oppositeend of the ban lja distance equal to what was gained by the end? of 3. The combination with a'brake band of the character described having reciprocable i means incocperative relation therewith for applying andi'eleasing 'the band, of means carried upon one end of the band for engagemen-t with the opposite end thereof,

means upon said last mentioned end for 00-,

operative engagement with the means carried upon the other end. I

In testimony whereof I hereunto aifix my signature in the presence of two witnesses.

, CLARENCE C. FAY. Witnesses;

S. GEoSTivEN's,

H. L.. LALIBER'rn. 

